Locksmith

Graph your level progression!  Inspired by the Boss Keys YouTube series by Game Maker's Tool Kit.

Controls
Middle click and drag to pan
Scroll over emptiness to zoom
Scroll over a node to change its icon
Shift+scroll over a node to change its shape
Left click emptiness to place a node
Left click a node and drag to move it
Drag one node onto another to nest them
Right click a node to delete it and its children

Autosaving is included!